Adding a Second Storey to Your Perth Home: Cost, Benefits & What to Expect

If you love your home but feel like you’re running out of space, a second-storey addition could be the perfect solution. For many Perth homeowners, building up instead of moving out is an affordable and practical way to get the extra room they need—without sacrificing their location, garden, or lifestyle.

In this guide, we’ll answer the most common questions Perth families ask about second-storey additions:

• How much does a second-storey addition cost in Perth?
• What are the benefits of building up instead of moving?
• How long does the process take?
• What should you look for in a builder?

Let’s explore everything you need to know before making the move—upwards!

Why Choose a Second-Storey Addition?

Second-storey additions are becoming increasingly popular across Perth suburbs like Mount Lawley, Subiaco, Cottesloe, Scarborough, and Joondalup. The main reasons include:

• Avoiding the cost of moving – Real estate fees, stamp duty, and relocation costs can easily add up to tens of thousands of dollars.
• Keeping your location – If you’re in love with your neighbourhood, school catchment, or beachside views, you don’t have to move to gain space.
• Maximising land use – With block sizes shrinking in many Perth suburbs, extending upwards makes better use of limited land.
• Adding value – A well-designed second-storey addition can increase your home’s resale value significantly.

How Much Does a Second-Storey Addition Cost in Perth?

The cost of adding a second storey in Perth can vary depending on the size, design, and materials used. On average:

• Basic additions (such as a single master suite, bedroom, or parents retreat) can start from around $400,000 – $450,000.
• Larger projects (multiple bedrooms, bathrooms, or a living area) typically range from $450,000 – $600,000+.

At Sertorio Homes, we provide detailed quotes tailored to your needs so you’ll have a clear picture of costs upfront—no hidden surprises.

How Long Does a Second-Storey Addition Take?

Most Perth second-storey additions take around 12 to 14 months from design to completion, depending on approvals, weather, and complexity.
The process usually includes:

1. Initial consultation & design planning
2. Engineering & council approvals
3. Construction of the second storey (often while you continue living downstairs)
4. Finishing touches – fixtures, and final inspections

Can You Live at Home During Construction?

In many cases, yes. Sertorio Homes uses building techniques that allow families to remain in the lower level of their home while the upper storey is being constructed. This minimises disruption, though some short-term relocations may be required during structural phases.

What Should You Include in a Second-Storey Addition?

Popular inclusions for Perth second-storey builds include:

• Master suite retreats with walk-in wardrobes and luxury ensuites
• Children’s bedrooms to give growing families more space
• Upstairs living areas for entertaining or relaxation
• Balconies to take advantage of Perth’s stunning weather and coastal views

Our design team works closely with you to ensure the new level blends seamlessly with your existing home.

Choosing the Right Builder in Perth

Not all builders have the experience required for complex second-storey additions. Look for a builder who:

• Specialises in home extensions and renovations (not just new builds)
• Has a strong track record of projects across Perth
• Provides transparent pricing and timelines
• Offers full project management, from design to handover

With over 45 years of experience, Sertorio Homes has built a reputation as one of Perth’s most trusted home extension specialists.

Final Thoughts

A second-storey addition is one of the best investments you can make in your home. It gives you space, adds value, and keeps you connected to the Perth lifestyle you love—all without the stress of moving.

If you’re considering building up, start with a conversation. Our team at Sertorio Homes will guide you through every stage, from concept design to completion, ensuring your second-storey addition is beautiful, functional, and built to last.

Ready to add more space to your home? Contact Sertorio Homes today to book a free consultation and find out how a second-storey addition in Perth could transform your lifestyle.